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You can save Image Processor settings for future use and reload them when necessary.

If you have already recorded a sequence of actions in Photoshop to do resizing,
you can use Image Processor to run the sequence on a of group images.
==================================================================Image Processor Pro is way better that the image processor included in photoshop itself.
It's available free from here: http://russellbrown.com/scripts.html

You have had 3 good answers that should provide you the means to do what you want, but there is just one issue that hasn't really been discussed.

You want ALL the images in a folder resized to 300 x 300 pixels. There is an assumption that all the original large images will be absolutely square (for example 600 x 600, 900 x 900, or other equal sided dimension) and can therefore be resized and still stay as squares. IF the original larger images are all different dimensions, and some are in portarit mode while others are in landscape mode, then a mass conversion of all images to 300 x 300 squares will work fine, BUT the subject in the images may be squashed horizontally or vertically.

Go ahead with the suggestions if it doesn't matter whether the subject in the images gets deformed in the process, or if all of your large images are perfectly square already, but read on if this does affect you.

Here they are shown as thumbnail representations in an image editor with a red square in each image.If they were all resized to 300 x 300 squares, the squares in the 2nd and 3rd images are squashed horizontally and vertically, respectively:
There is always a setting in "Resize" functions of image editor entitled "Maintain Aspect Ratio". When selected, this will resize the image by equal amounts on both sides so that the image doesn't become deformed.

If you really need the subject in your images to remain in proportion across the width and height, you would have to maintain the aspect ratio of the images while resizing. The problem with this is that the two rectangular images cannot be resized to perfect 300 x 300 pixel squares AND maintain the original aspect ratio at the same time.

To resize your 1600 x 1200 image to approximately "300", while maintaining the aspect ratio so as not to deform the subject, to an image the process will either have to create a landscape mode 400 x 300 pixel rectangle or a 300 x 225 pixel image.

To do the same with your 960 x 1280 image, you would get a portrait mode 225 x 300 image or a 300 x 400 one.

There is no other way to resize larger images of different dimensions and layout modes to 300 x 300 square images and keep the subject free from deformation without cropping the images in the process.

An educated guess tells me that your 300 x 300 images will be large thumbnails in web pages that, when clicked on, will show the original large images. If this is the case, then at that size the image would look odd to the page viewer if the subject was squashed or stretched out of proportion.

There are quite a few free or cheap programs that allow you to automatically create thumbnails of a defined size from larger images, and they will crop the images to size so as to keep the proportions of the subject in the image while (hopefully) still keeping the main part of the image visible in the thumbnail.

I have used a few "auto thumbnailer" programs in the past, but the one I used the most was part of a program named Visual LightBox that comes with templates to create nice photo slideshows and image presentation effects. I just used the thumbnails from the final files because I liked them. A program like that is probably overkill for the task in hand, but we could perhaps sugegst other simpler "thumbnailers" if you need.

As I said, I hope that your large source images ARE already square and that you won't have had to read down to here.

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